Construction of the Cell Membrane
7.3 DR part1 Name____________________Hr___
Construction of the Cell Membrane page 182
DRAW Figure 7-12 and LABEL its parts:
1. What are the two functions of the cell membrane?
1.________________________________________________________________
2.________________________________________________________________
2. What is the doubled layered sheet of cell membrane called?___________________
3. How many layers make up the lipid bilayer? _________
4. The lipid bilayer provides ___________ and a __________ barrier between cell and its environment.
5. Name two other molecules that are part of the cell membrane.
1...__________________ 2.___________________
6. What are the functions of the proteins in the cell membrane? _______________________
7. What is the function of the carbohydrates that are part of the cell membrane?
_______________________
8. What type of organisms have cell walls? Name 4. 1,_____________2._________________
3._______________ 4._________________
9. What substances are allowed to pass through the cell wall?_________________________
___________________________________________________________________
10. What is the main function of the cell wall?___________________________________
11. What is the composition of cell walls in plants?_________________________________
7.3 DR part2
Diffusion page 183
1. T or F. All living cells exist in liquid environments.
2. Why is important for the cell membrane to be in a liquid environment? ______________
_____________________________________________________________________
3. What is the cytoplasm composed of?________________________________________
4. What is a solution?____________________________________________________
5. What are the dissolved substances in a solution called?________________________
6. Define concentration of a solution. _______________________________________
__________________________________________________________________
7. What is the concentration of a solution that has 12 grams of salt in 3 Liters of water?
______________
8. What is the concentration of a solution that has 12 grams of salt in 6 Liters of water?
__________
Which solution (from question #7 OR #8) is more concentrated?______________
9. In figure 7-14, the picture illustrates the process of DIFFUSION. Explain in your own words what occurs, AND WHY at steps A, B, and C.
|Step A |Step B |Step c |
| | | |
10. Describe the process of Diffusion: _________________________________________ ______________________________________________________________________ ______________________________________________________________________
11. Describe the concentration of a solute when it has reached equilibrium: ______________ ______________________________________________________________________
12. Describe how diffusion and equilibrium work in a situation where a substance is present in unequal concentrations on either side of a cell membrane. ____________________________ _______________________________________________________________________
13. Why doesn’t diffusion require energy? ________________________________________
14. When equilibrium is reached, do particles keep moving or stop moving? ________________ Explain.__________________________________________________________________
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